Update clang to r339409.

Change-Id: I800772d2d838223be1f6b40d490c4591b937fca2
diff --git a/linux-x64/clang/include/llvm/MC/MCFixupKindInfo.h b/linux-x64/clang/include/llvm/MC/MCFixupKindInfo.h
index 58183bd..483abb3 100644
--- a/linux-x64/clang/include/llvm/MC/MCFixupKindInfo.h
+++ b/linux-x64/clang/include/llvm/MC/MCFixupKindInfo.h
@@ -12,7 +12,7 @@
 
 namespace llvm {
 
-/// \brief Target independent information on a fixup kind.
+/// Target independent information on a fixup kind.
 struct MCFixupKindInfo {
   enum FixupKindFlags {
     /// Is this fixup kind PCrelative? This is used by the assembler backend to